Kervarrec T, et al. - This paper encompassed the identification of the discriminative criteria for the differential diagnosis between Merkel cell carcinoma, a cutaneous tumor or a lymph node without primary tumor (MCCWP), lymph node metastasis (LNM) from cutaneous MCC and LNM from other neuroendocrine carcinomas (LNMNECs). The inference drawn was that MCCWP could be distinguished from other LNMNEC via the Elderly age, Location of the tumor, Extent, Cytokeratin and TTF-1 expression, Histologic types and Polyomavirus (ELECTHIP) criteria.